Home / 21,129.30-31,730.40-11,287.80

Finding the Fourth Proportional to 21,129.30, 31,730.40 and 11,287.80

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Solution

The fourth proportional to 21,129.30, 31,730.40 and 11,287.80 is: 16,951.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,129.30 : 31,730.40 = 11,287.80 : x
  2. Step 2: Convert to fraction form
    21,129.30/31,730.40 = 11,287.80/x
  3. Step 3: Cross multiply
    21,129.30x = 31,730.40 × 11,287.80
  4. Step 4: Simplify right side
    21,129.30x = 358,166,409.12
  5. Step 5: Solve for x
    x = 358,166,409.12/21,129.30
  6. Step 6: Final answer
    x = 16,951.17

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.